Method of receiving telegraph signals



Dec. 26, 1922.

C. H! TEEGARDEN.

METHOD OF RECEIVING TELEGRAPH SIGNALS.

FILED SEPT.9, 1918.

wil

A L I H119 Patented Dec, 2%, i922.

irritate i I a. Ki ali?" CHESTER H. TEEG-ARDEN, OF HASHINGTON, DISTRICT OF COLUMBIA.

EIETHOD OF RECEIVING TELEGRAPH SIGNALS.

Application filed September vide a supplementary receiving set which may be attached to a duplex telegraph system to receive all rnessag transmitted over the system without in any way interfering with the operation or, thesyst-ein. 1

1n the drawings ll grammatically theappl cation of my invention to a duplex telegraph system of the socalled differential type.

Referring to the drawingsfior a detailed description of my invention, A and. ll rep- .-:esent two stations of a duplextelegraph system. These two stations are duplicates and a description or one will sutlice to de-.

scribe both. Each station is provided with a differential polarized. relay l. PlOY'ldGtl. with coils 2. and The coil 2 is connected in series between the line 20 and key 3. One terminal oi the coil 4 is connected to a terminal of the coil 2 and th to hey "8. The other terminal is connected to the ;round86 through the variable resistance This variable resistance :torms What called the artificial line and is so n'oportioned that its resistance is equal to that of the line 20. The key 3 normally held in raised position in engagement with a contactiifconnectedtothe positive end of battery 9. Upon (l nfession oi? the key 3 it en s the cont 8 connected to the negative end of batto. 9. The mid point of this battery 25 J connected to the a conductor 10.

'lhe relay 1 is prmrided with anfarniature l2 movable between a stop and a fixed cont-act 7.5 the latterbeing connected to one terminal oi a sounder 16. The other terminal of this sounder is connected tobattery 15 and the othcrterrninal of this local battery is connected to the armature 12. The

ground at 11 by means of sounder 16 is provided with an armature 17 no mally hold retracted against the stop 18 h the spring 19.

Assuming the gap 2l-22 to he bridged,

rm'enients in Methoils oi Receiv have illustrated diae, 1918. Serial no. 253,309.

the above described parts form the ordinary 'duplei: telegraph line of the differential typeand the operation as follows:ll ith both keys in the raised position as shown both stations are sending positive potential on to the line 20. These two potentials balance and accordingly no current flows through coil 2. A local current however, flows at. each end as follows z irom battery 9 through contact 7, key 3 coil 4t, resistance 5,.ground 6, ground 11 and conductor 10 back to battery 9. This current flows through coil 4: in such direction as to inove' armature 12 against the stop 13, and accordingly the sounder is not energized and no signal is given.

W hen either of the keys 3 is depressed, for example the key at station A.. a negative potential is thrown on the line by that station. ll ith the depression of the key at station A, current. will iiow from the battery 9 at station B through key coil 2, line 20, coil 2 at station AJuey 3, contact 8, left half of batter 9. conductor 10. ground 11 at station E back to battery 9 of that station. This cur rent flows through the coil 2 at station E in such direction as to tend to move the armature 1 against the contact 1 1-. This movement, however isstill opposed by the action of the coil 4. ill; will be noted, however that the resistance encountered. by the current through coil 2 is substantially the same as that encountered through coil 4 but that the electroniotim force driving the current through coil is twice that driving; the current through coil 4. The coil 2 will accordingly predominate over the coil a and the armature 12 will be moved against contact 14: to energize sounder 15 and indicate the depression of the hey at station A. hegginning of the signal. At station A. the depression of thelrey T will reverse the current through coil fl so that coil lnow tends to move armature 12 against contact 1-1:. At the same time, however, a current has been set up through coil 2 which flows through the coil in such adirection as to tend to move armature 12 against the stop 18. As previously stated, coil 2 predomiand the turns to its positionagainst stop 13, thus causing the deenergization of sounder 16 and permitting the retraction of armature 17 to indicate the termination of the signal. The subsequent depressions and releases of this key 7 will give corresponding attractions and retractions of armature 17. i i

It is obvious that should the Key '4' at station B be depressed, the armatu: Q 17 at'station A will be Similarly actuated. Should the key '7 at station B be depressed during the depression of key 7 at station A, the key at station E will also connect negative potential to the line 20. This will result in no current flowing through to line 20 and coils 2. Accordingly at station A the coil at will be unopposed and will cause the movement of the armature 12 against contact to energize sounder 16 and attract armature 17. At station E the depression of key 7 wll. cause a reversal of the current in coil t similar to that which occurred at station A, and

' battery 3132 is connected to contact cause a similar movement of armature 12 against contact 14, and a similar energization of sounder 16 to attract armature 17. Accordingly both armatures will be at tracted to indicate at each station a signal from the other station hen either lrey is released the condition prevailing will be the same as though that lrey had not been depressed and this condition will be the same as that previously described and accordingly will cause the retraction of the armature at the station other than that where the key has been released, to indicate that station the release of the key at the other station and the termination of the signal from the other station.

The above is the operation ot the wellknown differential. duplex telegraph. It will be apparent that four conditions prevail upon the line 20. There may be current flowing in either direction, or there may be no current flowingbut maximum potential either positive or negative. My invention utilizes these four conditions to indicate the transmission of messages over the line in either or both directions.

In applying my invention the line is severed at 2122 and relay 23 is inserted in series with the line. To one terminal of the armature 24: ot the relay 23 is connected a conductor l6 which is connected through the reversing switch and conductor to one terminal of the coil 43. The other terminal of this coil is connected through the conductor 4L2, switch 35, conductor d1, switch 36, conductor 40, to the coil 38 0t relay 39. The other terminal of this coil. 38 is connected through the conductorfili', switch 36 and conductor 3a to the mid point 33 01. bat tery 3l32. It will be understood that the switches 35, 36, 56 and 57 are normally in their upper position. The positive end of and the negative end to contact 30, these two contacts being so positioned as'to the armature 2% in its two extreme positions.

The armature 24 is provided with an insulated insert 25 carrying a contact plug 26, which is normally engaged by the two springcontacts 27 and 28 which serve to hold the armature normally in .mid position. The contact 28 is connected to mid point 33 of battery 8132, while the contact 2? is connected through conductor 55, switch 57, conductor 58, to the coil 59 t relay 39. The other terminal of this coil is connected through conductor 60, switch 57, conductor 61, switch 56, conductor (32, to the coil. 63 ct relay lt. The other terminal of the coil. is connected through conductor 6%, switch 56, conductor 65, to armature 51 ot a relay 50. The two contacts 52 and 53 of this relay are respectively connected to the negative and positive terminals oi. battery and are so positioned as to be engaged by armature 51 in its two extreme positions. This relay is connected through the variable resistance 48 and variable condenser 49 between the line 20 ano the ground.

Relays a4. and 39 are duplicates. Each is provided with two coils as shown'and with armature 66 or 67. These armatures held retracted by springs 68 and 69 and are attracted to the raised position by permanently energized magnets 70 and 71. These magnets are so placed that they are no rable to overcome the spring tension and a tract the armatures 66 and 67 when the arm atures are in their lower position, but the magnets are of sutlicient strength to retain the armatures in raised position when t y have been so raised by action, of the relay coils. t will be seen that the armature of this type relay remains in either extreme position until moved to the other position by a positive force. I make use or this property to prevent chattering oi' the armature during a shift in relay connections which isnot to move the armature to its other position.

The operation ct my attachment is as t'ollows: ll hen no message is being transmitted over the line 20 no current is flowing and the armature 24 is in a neutral position. At the same time positive potential prevails on the line and an instantaneous current has flowed from the battery 9 at both stations into line 20 through variable resistance 48, capar't 4L9, relay 50, to ground and thence back 110 liioth batteries. This energizes relay 30 in such a direction as to cause armature 51 to engage contact 53. This permits a current to flow from battery 31 through contact 53, armature 51, conductor 65, switch conductor 64, coil 63, conductor 62. switch 56, conductor 61, switch 57, conductor 60, coil 59, conductor 58, switch 5?,condoctor 55, contact 27, plug 26, contact 28, conductor back to battery 31. This current is in such direction in jeoils 59 and 63 utures 67 and. 66 in their n rmai .lOSlblOll. Accordinvl T no indication or 66. Should either lrey 7 he depressed, toreiiample that at stations. current Will flow through the coil of relay 23 :rrorn SildblOfl B to station A, This will cause the urnniture to move to the r ght to engage :r. nnecti.on between spring contact 27 and A ring contact of) and 68. The engagement of armature 24- *itch 36 conductor 37, coil conducio; 10,, switch 36 conductor i switch 35 centimeter 4:2, coil eti conductor 4:5, switch &5, conductor L6, armature 24, contact 30, hack to the negative end of battery 32. T his current jloivs through the icoil 38 in. such direction as to cause armature 6'! to he moved into its raised position and thus indicate the trunsmission or a message from station it to station E. -Thecurrent,

howevezy traverses coil 43 sucii a direction not to actuate armature 66. Upon the ease of the key at station A. current will cease flowing through reluy 28 and armature 2 lwill assume itsmid position, atthe same time bridging-grip 27-28. Return of positive potential to the line will cause the operation iot the relay 50 to complete the circuit above described in reference to this relay and thus to energize the coils 63 and 59. in such direction as to allow armature 66 to remain in position. The energiznztion of coil 59" in the some direction and accordingly returns armature 6? to its normal or lower )osition, "ius indicating the raising of the key at station 3 and the termination of the i .l. Successive actuation of the key 7 set all messages sent fromstation 0 station E. f

=t obvious from the above description ithe drawings that operation of the station B will cause similar actue the armature 66 of relay er, and.

A 265contact 7, conductor 55,switch any signal is given by either armature the contact and simultaneously open the This. deenergizes coils -li'oin point through conductor The energization of the. coil will he corresponding uctuutions of the. wtuic t'i' thus .-.nd1cat1ng at the supple cste ell messages transmitted front resistance ll; to the line '1. 56, conductch 56, conwe ens of battery This cur- \s through both the coils 63 and 59 raiser position and qiss on otu signal in i i 1 he on the line, the contact 59 Will be r lower positions to inof the signals. 11 before the other,

2 second. signal is instiion of the second sigsly return the arn'iature 2% 'fiion, actuate the relay and c tne is n 'ure 66 or (5*? which is not 1y raised leaving the previously raised :ture in raised position Should ether leased. before the other, the relay 5U come n o play to lower armature {it or '87 corresponthng to the ruisedizey and retain in raised position the other armature to thus heat tion. of; the one signal and new one under suchconditions are ben Wl I l which lie 20 normally carries posE.-. tire potential. lWhil-e this is one system, some systems n use. wherein the line normally 21's are in use where the one station ncrl .uy impressesnegative pots cl "\Tllllij the {)a'liifil station normallyiinpre positive potential; Should Slilsfil"Shn lOl'l or e inpie station normally impress potential on i line, it is obvious that the armature 67 would heraise i to. indi transm. of u signal to station at s time when no signal is heng' transmitted, end would operate i'eierselfi.

I -Q31" x11 conzliiioiu the rennil EKG--53? the condition aho c switch --5? w he thrown to itslowcr position to reverse i e do the direction. of flow through coils and 59 oi relay 39 and. thus restore the normal position oi armature 6 to that shown in the drawing. Iithoth stations nc ially impress negative potentiul on the l1ne lootl into the reversing switches will he thrown lower position. 1 1

lit will be apgarent from the ahovethat my receiving sfiil lilll operate irrespective oi v, conductor (30,

(35, miniature 5i, and contact 52 back hcn tot-h lreys are raised? and 6? will he 2t rowingtl'irougli the will cez e to tiiinction, but the relay 22 will i. o he obvious from the drawings and a detailed description thereoiis considered direction as to cause both srmatures "nation. the other. The circuits .L havev described E'JlVC potential, and

already complete t t provided with a coils in a reverse direc trolled hythe first mentioned relay adapted is equallyapplicahle to the duplex telegraphy or to any type the i our conditions of no sign 7 one direct-ion in the l i s in hot i .rections: en

ourconditions of positive potent t t in eve poten ,t that i c ietallic i may indie device. 11 that i use the texn so set to indicate a set e or over that line inderoessages transmit I stations essential to the pendent of those line;

The above modifications and all others which come Within the scope of theappend vention.

What I claim is?- 1. r; supplementary receiving set for a duplex telegraph line comprising a polarized. relayinserted in said line responsive to current flow in said line and biased to inid-pocition two polarized sounders each first and second coil an armature for each sounder, connect is whereby the first coil of one ot' said Sounders is energized by the operation of the line relay in one direction and the first coil of the other sounder is energized by the operation or the line relay in the other directioin a second polarized relay connection between the line and the ground,connections Wl16Y- by operation or the second relay in one direction energizes the said second sounder coils in one direction and operation in a re verse direction energizes said s i sounder to open a circuitcontrolled by the second relay Whenever the first mentioned relay is moved out of mid-position undaplurality of reversing switches each serving to reverse simultaneously both coils of one of the Sounders. it

2. A supplementary receiving set for a duplex telegraph line comprising a polarized'relay inserted in said line responsive eto circuit flow in said line and biased to mid-- switch confor preventing position, two poladzed Sounders each provided With a first end a second coil, an

j sounder coil of one of said "zed hy the operation or in one direction and the first line relay coil of the other sounder operation or the line'relayin the other d I'E'fil a second polarized relay connected between the line and the ground, connections whereby operation of the s cond relay in one direction ener izes the second line relay is moved out of mid-position.

A supplementary receiving set for a duplex telegraph line comprising a relay nergized by connections I inserted in said line, responsive to a current flow in said line and biased to mid-p0sition, tv/o sounder-s each provided with a first and second coil, the armature of each sounder hein normally in retracted position, connect-ions whereby the first coil or one of the sounders is energized by operation of the line relay in one direction and the'firstcoil of the other sounder is energized by operation of the line relay in the other di-' rection a second relay connected between the line and the ground, connections whereby operation'of the second relay in one direction energizes the second sounder coils in one direction andoperation in a reverse direction energizes the second sounder coils in a reverse direction, and means responsive to linecurrent for preventing energization of said second sounder coils. I

i. A supplementary receiving set for a du elex telegraph line, comprising a relay responsive to current flow in the line, two sounders each provided With a first and a second coil, an armature for each sounder, connections whereby the first coil of'one of the sounders" is energized'hy the operation of the lineflrelay in one direction'and the first coil'ot the other sounder'is energized by operation of the line relay in the other direction, a second-relay responsive to line potential, connections whereby operation of the second relay in one direction energizes the second sounder coils in one direction and operation" in a reverse direction energizes said second sounder coils in a reverse direc tion, and means responsive to line current coils. Y t i 5. A supplementary receiving set for a duplex telegraph line comprising a relay inserted in said line, responsive to current flow in the line and biased to mid-position tWo soun'ders each'provided With a first and a energization of said second and the first coil oi the other sounder is energized by. operation of the line relay in r the other d rection, a second relay connected between the line and the ground, connections whereby operation of the second relay in one direction energizes the said second sounder coils in one direction and operation. in a reverse direction energizes the second sounder coils in a reverse direc tion, and means responsive to line current for preventing energization oil? said second sounder coils. y

6. J; supplementary receiving set for a duplex telegraph line comprising a relay inserted in said line, responsive to current "flow in the line and biased to mid-position, two sounders each provided with a first and a second coil, an armature for each sounder, connections whereby energization: or the first coil of each sounder'is dependent upon the line relay, a second relay connected. betweentlie line and the ground, connections whereby energization of the second coil of each sounder is dependent upon. the second relay, and means responsive toline current for preventing energization of saidsecond sounder coils. y

7. A supplementary receiving set fora duplex telegraph line comprising a relay inserted in the line and biased to mid-posi-v tion, two sounder-s each provided with a first and a second coil, connections whereby energization of the first coil of each sounder is dependent upon the line relay, a second relay connected between the line and the ground, connections whereby energizationot the second coil'of each sounder is dependent upon the second relay, and means responsive to line current for preventing energization of said second sounder coils.

8. A supplementary receiving set for a duplex telegraph line comprising a relay re-. sponsive to current flow in the line, two Sounders each provided with a first and a second coil, connections whereby the first coil of one of the sounders is energized by operation of the line relay in one direction and the first coil of the other sounder is energized by operation of the line relay in the other direction, a second relay responsive to line potential, connections whereby op eration of the second relay in one direction energizesthe second sounder coils in one direction and operation in the reverse direction energizes the second sounder coils in the reverse direction, and means responsive to line current for preventing energization of the said second sounder coils.

9. A supplementary receiving a set for a duplex telegraph line, comprising a relay responsive to current flow in said line, two sounders each provided with 1 two in pendent coils, connections of said second parts.

dependent coils, connections whereby the energlzation of the one coil of each sounder .is dependent upon said relay, a relay responsive to line potential, connections whereby the energization of the second coil of each sounder is dependent upon said potential 'responsiverelay, and means responsive to line current for preventing energization of said second coils.

10. A supplementary receiving set for a duplex telegraph line, comprising means responsive to current flow in said line, two sounders each provided with two indewhereby the energization of the one coil oi each sounder is dependent upon said means, means responsive to line potential, connections whereby the energizaion of the second coil of each sounder is dependent upon said potential responsive Imeans, and means responsive to line current for preventing energization of said second coils. y

11. A supplementary receiving set for a duplex telegraph line, comprising a relay responsive to current flow in said line, two indicating means, each provided with two separate actuating parts, connections whereby the energization of the one part of each means is dependent upon said relay, a relay responsive to line potential, connections whereby the energization ofthe second part of each means is dependent upon said potential responsive relay, and means responsive to line current for preventing energization y 12. A supplementary receiving set fora duplex telegraph line, comprising a' relay responsive to current flow in said line, two sounders each provided with two inclependent coils, means whereby said current responsive means controls the energization 0130116 coil of each sounder, a relay responsive to line potential, means whereby said potential responsive vmeans controls the energization or the second coil of each sounder, and means responsive toline current for preventing energization' of said second coil ofsaid sounders.

13. A supplementary receiving'set for a duplex telegraph line, comprising means responsive to current flow in said line, two

indicating means, each provided with two separate actuating parts, connections where- .by the energization of the one actuating part b of each indicating means is dependent 1113011 said relay, means responsive to line potential, connections wherebythe energization of the second actuating part of each indicating means is dependent upon said potential responsive relay, and means responsive to line current for preventing second parts. y

14. A supplementary receiving set for a duplex telegraph line, comprising means respensive to current flowin said line, two

energiz ation of said i sounders each provided with two independone coil of each sounder, means responsive to line PQt nt'ial, means, whereby said potential responsive means controls the energization otthe second coil of each sounder, and duplex telegraph line conmri-sing two indicating devices corresponding to the is means responsive to, linecurrent for preventing energization of said second coils of said sounders. l V

'15. A supplementary receiving'settor a duplex telegraph line comprising a relay res'ponsive to current flow iii'said line, two

indicating means, each provided with two separate actuating parts means whereby said current responsive relay controls the energiation of one actuating part of each indicatingmeanaarelay responsive to line potent al means whereby said potential responsive relay controls the energization of the second actuating part of each indicatingmeans,

and means responsive toline current'ior preventing energizationfoi' said second actuating part of said indicating means.

16. ,A supplementary receiving set tor a duplex telegraph line, comprising' means responsive to current fiowin said line, two indicating means, each provided With two separate actuating parts, j means whereby said current responsive means controlsthe energization ofone actuating part of each indicating" means, means responsive to line potential, means whereby said potential re- SPODSIVGIIVIBELQS controls the energizat on of the secondactuatmg part of eache nd catmp;

means, andmeans responsive to line current for preventing energ zation of said second actuatingpart off said indicating means.

17. A supplementary receiving; set :tor a duplex telegraph line comprising' a relayresponsive to current-flop in said line,means for indicating messages being transmittech means whereby said. current responsive relay acts to control. said indicatingfmea-ns, a relay responsive to potential, means whereby said responsivepotentialrelay acts to control saidindieating means, and means responsive to linelclurrent torpreventing controlot said indicating means said potential responsive relay.

18. supplementary receiving set fora duplex telegraph line c omprisingi means responsive to current flow in said line, means ref indicating messages beingtransmitted, means whereby" said current responsive eans acts to control said-indicating means, means responsive to line potential, means whereby said potential responsive means acts to control saidindicating means, and means responsive to line current for preventing Qontrol of said, indicating means by said potential responsive means.

, 1 9. supplementary receiving set for a duple telegraphline, comprising indicating means, nea e responsive. to line potential line potential for nia'intainn lie ee spective line stations, means responsive to both indicating: devices inoperative wh n the line inactive, and means responsive to current tier-c inthe line representing actuation of receiving); means at one line station. for rendering the corresponding indicating device ot the supplementary set operative to indicate the signal impulse in. the line.

2i. 1" su e-mcntary rece ving, set for a duplex; telegrah line comprising two indicating devices corresponding to the re oective line stations, means responsive to .he potential for maintaining: both indicating devices inoperative Wl en the line is inactive,

and means responsive to current fiow in the line. representing actuation of receiving means at one line station for rendering the corresponding indicating device of the supplementary set operative to indicate the signal impulse in the line, and meansvresponsive to unidirectional current -floW',.in the line for niaintainingrthe other indicating device inoperative.

22. A, supplementary receiving 5 set tora duplex telepraph line compr sing-two 1ndicating devices correspondingto. the arespective line stations, means responsive to line potential for maintaining both indicating; devices inoperative when theline is inactive ineans responsiveto current flow in the line representing actuation of receiving rendering-the cor V the supplementary set operative to indicate the signal, ipulse in the line,.means responsive to unidirectional on: rent flow in the line,

. for maintaining the other indicatingdevice inoperative, and means responsive to increase in the line potentlal representing simultaneous operation of both line station receiving; means for rendering both indicating devices operative.

. :23. A telegraphsystem comprising a line circuit, interconnecting two stations, duplex transmitting and receiving apparatus at each of said stations, and arecording device associated with said line circuit at any desired point therein, said recording device including a plurality-oft relay windings, one

,of said windings being connected in series with said line circuit, another or said Windings being connected as a shunt. on said line circuit and a local recording circuit controlled by said windings. 7 I

' 24-. A telegraph system comprising a line circuit interconnecting two stations, duplex and receiving iQfJtLiiLillS 21?; each m V *uticus, and a i'eeordlug device a, mciziicd 'tii said line circuit at any desired peint therein recording and nuiing impulses originating 21?; ei- 1.e7' of said 'stutiene, said recording device local circuit relay windings in series and in shunt Wiiil Eaiv uni! controlled by ihe manner cf I tion with said line circuit, feiccuti'elliugz said 10021.1 circuit in accordance with "zhe $15.1- lingr impulses origgiueriug at a certain cue we :-:!;auiens. 25. ii tele mph circuit; intei'cennecti ig tu'e s-imrtions dugiex tirzmsmitting :iuri receiving up miaft each of said. SililiiOllS and CIELDSlflit'ililg pin-Mus at each station being adaeierl m .pply n'mrking and spucilig signaiiug' ini- I J spectively no sum line CII'OUM], and recording device ISSOClZli'Qd with said 11110011701115 eystem compriein i a iiue line eireuii 11.528 of positive and negative polarity re-c 5; over said 1i. 1e Circuit combined eii'ect of the signaling impulses to said stations, the other meeted shunt of said ing cont-roiled by the cur:- FiOW eve]? shunt due tethe differ- 7 potential betweeuthe sides of said said 'reic y windings Mini/rolling said local cii'cuii: iu accordance with he Sig iiaiing impuieee applied to said line circuit zie one of sziid stations.

In testimony whei'eo signature.

eiiueiu u H. TEEGARDEJ.

I have iliiiXGd my wh t and being comm-011ml 

